Combine the lemon zest, garlic, salt and pepper in a small bowl. Slice the reserved meat and arrange on a platter. Scatter the lemon-garlic mixture over the meat. Set aside while you make the sauces.
Finely chop the reserved tomatoes, and mix with the oil, vinegar, and tomato paste,=. Season with salt and pepper. Set aside. In a separate bowl, whisk the reserved Caesar salad dressing with the cheese and mayonnaise. Season with salt and pepper. Serve the roast beef with the sauces on the side.
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